InterSub
InterSub offers AI-powered dual subtitles and instant word translations for language learning.
At a glance
Starts at
$6 per month
Includes unlimited word lookups, dual subtitles with AI translation, and frequent words reminders. Excludes access to mobile app integrations for free plan users.
Free tier
Yes, limited
Platforms
Web, Chrome, Telegram
Best for
Language learners, content viewers
Not for
Advanced grammar students
4.0 out of 5
Scored by Alex after real useOur verdict
Works on multiple platforms; supports over 30 languages. Not ideal if you need extensive phonetic support or want more advanced grammar tutoring.
✓What it does well
Multi-Platform SupportWorks across YouTube, Netflix, Coursera, LinkedIn Learning, and others.
Instant TranslationsHover over words for AI-generated definitions in context.
Personal Vocabulary TrackingWords are automatically saved to your personal vocabulary list.
✕Where it falls short
Limited Phonetic SupportDoesn't provide detailed phonetic pronunciation guides.
No Advanced Grammar TutoringPrimarily focused on word translations rather than full grammar lessons.
Mobile Apps Not Included in Free PlanFree plan users don't get access to mobile app integrations like Anki.
Key features
AI-Assisted Dual SubtitlesWatch videos with subtitles in target and native languages side-by-side.
Collocation DetectionRecognizes idioms, phrasal verbs, and compound nouns for better understanding.
Remote Control Word LookupUse your phone to look up words while watching on a big screen.
Phonetic GuidesProvides detailed phonetic pronunciation guides.